Patent GB-1235340-A (GB)
Title: Method of and apparatus for making electrical connections
IPC: H05K13/06
Filed: 1968-09-24
Abstract: 1,235,340. Work stations. TELEFUNKEN PATENTVERWERTUNGS G.m.b.H. 24 Sept., 1968 [17 Nov., 1967; 24 Feb., 1969; 29 Aug., 1968], No. 45269/68. Heading B4X. In a method of making electrical connection to a terminal 2 of a junction panel 1, the junction panel or its image is viewed through or in a mirror and the image of an optical marking is superimposed on the panel or its image so as to coincide with the terminal to which connection is to be made. In a first embodiment (Figs. 1a and 1b) the junction panel 1 is placed below an apertured plate 4, illuminated from the rear, and a partially reflecting mirror 3a and wholly reflecting mirror 3 are used to produce an image 1a of the panel. On this image is superimposed the image of an optical marking generated by the plate 4, whose aperture positions coincide with the terminal positions on the panel. Thus terminals 2a and 2c to which connection is to be made have superimposed on their images 2b and 2c, light spots generated by illumination of apertures 8b and 8a in plate 4 in accordance with an instruction fed into a programmed control unit 6. Simultaneously, a bin 10a containing wires of an appropriate length for the connection to be made, is lit up. Once the operative has effected the indicated connection, different terminals may be highlighted by illumination of other apertures in the plate 4 under control from unit 6, so that further connections may be made, an appropriate bin 10 being simultaneously indicated. The plate 4 may have one lamp for each aperture, in which case only selected lamps are lit to generate the optical marking, or alternatively one row and one column of lamps are lit such that the lamp common to both is lit more intensely than the rest, or alternatively one row and one column of lamps are lit equally and the lamp common to both corresponds to the selected terminal. In a modification (Fig. 2, not shown), the plate 4 is lit by a single lamp, and a shutter arrangement is provided to ensure that only the selected apertures pass light. In a second embodiment (Figs. 3 and 4, not shown) the junction panel (19) is viewed through a partly reflecting mirror (20) and the image of an optical marking generated by a movable lamp (21) is seen in this mirror superimposed on a selected terminal of the panel. The correct selected positions of the lamp are achieved by movement of the lamp along two orthogonal directions according to instructions fed from a programmed unit (25). The output from the latter varies the resistance in one arm of a Wheatstone bridge whereby a motor is coupled to a lamp carriage to move the lamp in one direction. Movement in the other orthogonal direction is effected from the same unit acting through an identical bridge and motor network. Movement of the lamp varies the resistance of another arm of each bridge to re-establish balance whereupon lamp movement ceases. In a modification (Fig. 5, not shown), a single bridge and motor network is used to move a double carriage part of which moves in one direction and mounts the other part which moves in the orthogonal direction. Various methods of testing the connections made are described and illustrated (Figs. 6 and 7, not shown). The method may be extended to making connections between a plurality of junction panels, and for simultaneously making similar connections on a plurality of separate panels. The projected paths of connecting wires may also be optically marked. It is stated that the method and apparatus may be used for placing circuit elements on a circuit chassis. Other modifications of various parts of the apparatus, or their mode of functioning, are described.